Cervix-clamp for use in dentistry.



PATENTED OCT. 24, 1905.

W. A. ROWE. CERVIX GLAMP FOR USE IN DENTISTRY.

APPLICATION rum) AUG.27. 1 04.

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WILLIAM ALEXANDER ROWE, OF GLOUCESTER, h lASSAOI-IUSETTS.

CERVIX-CILAIVIP FUR USE IN DENTISTRY.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed August 27, 1904. Serial No. 222,477.

Too/ 7, whom it may concern.-

Be it known that I, WILLIAM ALEXANDER town, a citizen of the United States, residing it Gloucester, in the county of Essex and State )f Massachusetts, have invented a new and :iseful Cervix-Clamp for Use in Dentistry, of which the following is a specification.

My invention is a cervix-clamp for use in lentistry, the objects of which are, first, to ush the gum away from the tooth operated ipon, either up or down, as may be required, LflJGI the rubber dam has been applied, thus ixposing the cavity and keeping it dry during ;he operation. I attain these objects by the nechanism illustrated in the accompanying lrawings, in which- Figure l is an isometric view of the comlete instrument. Fig. 2 is aside view of the nstrument minus the arms, showing the cor- 'ugated union in section. Fig. 3 is a front view of the instrument minus the arms, showng the corrugated union in section, as in Fig. 2. Fig. 4c is a front view of one of the two mns forming a portion of the instrument and shows the adjusting-nut in place, also the proiection near the end of the hook made use of keep the arms in close contact with the 100th. Fig. 5 is a side view of the arm deicribed under Fig. 4E and shows all details, as Jefore described, also the slot in which the Jar plays and upon which bar the adjustingtiut rests during the operation. Fig. 6 is a :ross'section of the nut and arm on line E F. Fig. 7 is a top view of the instrument minus Jhe arms and shows the bar referred to under Figs. 5 and 6, also the bar-support and the upper plate. Fig. 8 is a cross-section on line A B, the shaded portion indicating the corrugated union. Fig. 9 is a cross-section on line L D and shows a top view of the bottom plate together with a shaded cross-section of the lower screw.

Similar letters refer to similar parts throughout the several views.

The top plate a is supported upon the upper right screw 0, said upper plate being covered by a layer of pliable rubber 7), which rubber comes in direct contact with the cutting edge of the tooth which is pressed against it during the operation.

The bar-support consists of a flat shelf projecting at a right angle with the upper right screw 0 and bearing near its outer end the bar IL, against which the operating-nuts K: 75 upon the arms c' c' are forced while the in strument is in use.

The lower left screw (Z rests upon the lower plate e and is joined to and operated in conjunction with the upper right screw 0 by the corrugated union j. The union 7' is operated by a slight movement of the fingers, being turned to the left or right that the screws 0 and (Z may be drawn together or forced apart,

the case may require.

The lower plate supports the lower left screw (Z and is covered upon its under side by a layer of pliable rubber 7, which rubber comes in contact with the cutting edge of the teeth directly opposite those upon which the operation is to be perfori'ned.

The arms 2' are supported by the burred nuts 7: h, which nuts press upon the bar It. These arms a are made left and right, as shown in Fig. 1, and consist of a split screwshaft threaded and curved to the left and right and ending in a hook, near the end of which is a projection Z Z.

The projection [enables the operator to keep the hook end of the curved portion of the arm firmly against the tooth upon which the operation is to be performed.

The burred nuts Z: Z: play upon the threaded portion of the arms e' i and rest upon or are forced against the bar it, the arms 6 t' being raised or lowered by a turn of the burred nuts Z: Z).

The slot on in the threaded portion of the arms 2' 2' allows for the play of the arms i i upon the bar 71 hat I claim my invention, and desire to secure by Letters Patent, is-

1. In combination, a mouth-prop, an extension on the prop, and adjustable means carried by the extension for engaging a tooth.

2. In combination. a mouth-prop, an extension thereon, and arms carried by the extension for engaging a tooth.

3. In combination, a mouth-prop, an extension thereon, a bar carried by the extension and split arms engaging the bar.

l. In combination, a mouth-prop, an extension thereon, a bar carried by the extension, split arms engaging the bar, and means carried by the arms for regulating the movement of the arms of the bar in one direction.

5. In combination, a mouth-prop, an extension thereon, arms carried by the extension, and means carried by the arms for adjusting said arms with relation to the extension.

6. In combination, a mouth-prop, an extension thereon, and arms independent of each other carried by the extension.

7. In combination, amonth-prop, an extension thereon, threaded arms carried by the extension, and nuts Working on the arms and bearing on the extension for adjusting said arms.

8. In combination, a mouth-prop having an extension, a bar carried by the extension, split arms loosely engaging the bar and means for limiting the movement of the arms in one direction.

9. In combination, a mouth-prop, an extension thereon and arms carried by the extension, said arms having a curved end portion for engaging a tooth.

10. In combination, a mouthprop,an extension thereon, arms carried by the extension, and a projection on each of the arms for engaging a tooth.

11. In combination, a mouthprop,an extension thereon at right angles thereto, and means carried by the extension for engaging a tooth.

12. In combination, a fnonth-prop,an extension thereon, arms carried by the extension, each of said arms having an end portion curved, and projections on the curved portions of the arms.

13. In combination, a month-prop,an extension thereon, arms carried by the extension, and means carried by the arms to engage a tooth.

14:. In combination, a prop formed in sections, adjustable one With relation to the other, an extension carried by one of the sections, and arms carried by the extension.

In testimony \vhereofl have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM ALEXANDER ROWE.

Witnesses:

CLIFFORD B. TERRY, GILBERT N. PETTINGILL. 

